package models

import "time"

// SiteSetting holds the singleton (id=1) global display configuration:
// logo, top-left title, header banner text, and footer text, each with
// zh/en variants that fall back to i18n defaults when empty.
type SiteSetting struct {
	ID            uint      `gorm:"primarykey" json:"id"`
	Logo          string    `gorm:"size:512" json:"logo"`            // local filename (served under /uploads/logos) OR a full URL
	LogoTextZh    string    `gorm:"size:255" json:"logo_text_zh"`    // top-left title (zh)
	LogoTextEn    string    `gorm:"size:255" json:"logo_text_en"`    // top-left title (en)
	HeaderTextZh  string    `gorm:"size:512" json:"header_text_zh"`  // header banner text (zh)
	HeaderTextEn  string    `gorm:"size:512" json:"header_text_en"`  // header banner text (en)
	FooterTextZh  string    `gorm:"size:512" json:"footer_text_zh"`  // footer text (zh)
	FooterTextEn  string    `gorm:"size:512" json:"footer_text_en"`  // footer text (en)
	UpdatedBy     uint      `gorm:"index" json:"updated_by"`
	UpdatedAt     time.Time `json:"updated_at"`
}

// TableName overrides the default GORM table name.
func (SiteSetting) TableName() string {
	return "site_settings"
}

// LogoIsURL reports whether the logo value is an external URL rather than a
// local filename.
func (s *SiteSetting) LogoIsURL() bool {
	if s == nil || s.Logo == "" {
		return false
	}
	return len(s.Logo) >= 4 && (s.Logo[:4] == "http")
}

// LogoText returns the title for the given language code, falling back to the
// other language when the requested one is empty.
func (s *SiteSetting) LogoText(lang string) string {
	if lang == "zh" {
		if s.LogoTextZh != "" {
			return s.LogoTextZh
		}
		return s.LogoTextEn
	}
	if s.LogoTextEn != "" {
		return s.LogoTextEn
	}
	return s.LogoTextZh
}

// HeaderText returns the header banner text for the given language code,
// falling back to the other language when the requested one is empty.
func (s *SiteSetting) HeaderText(lang string) string {
	if lang == "zh" {
		if s.HeaderTextZh != "" {
			return s.HeaderTextZh
		}
		return s.HeaderTextEn
	}
	if s.HeaderTextEn != "" {
		return s.HeaderTextEn
	}
	return s.HeaderTextZh
}

// FooterText returns the footer text for the given language code, falling
// back to the other language when the requested one is empty.
func (s *SiteSetting) FooterText(lang string) string {
	if lang == "zh" {
		if s.FooterTextZh != "" {
			return s.FooterTextZh
		}
		return s.FooterTextEn
	}
	if s.FooterTextEn != "" {
		return s.FooterTextEn
	}
	return s.FooterTextZh
}